Saliva samples were collected on six occasions immediately before and 15 minutes after watching a four-minute long clip. The male athletes then performed a squat workout.

The report said the study contributes to the idea that sex improves an athlete's performance.

Antonio Miguel, head of medical services at the Club Universidad Nacional Pumas, one of Mexico's top soccer clubs, said that during the 1950s and 1960s, people thought that sex had a negative impact on players' performance.

Juan Carlos Medina, general coordinator of the sports department at the Tecnologico de Monterrey, at Mexico university, said sex can help wipe out mental fatigue to leave them feeling refreshed and confident.

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